1. to provide proper conditions for continuous complete combustion
2. mix fuel with air and ignite
3. separate ash from coal
4. maintain heat supply to prepare and ignite the incoming fuel
separate ash from coal
1. it has heating value
2. it helps in electrostatic precipitation of ash in flue-gases
3. it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
4. it erodes furnace walls
it erodes furnace walls
1. 1- moisture content
2. 1 + moisture content
3. 1 + moisture content
4. 1 - moisture content
1- moisture content
1. higher effectiveness of boiler
2. high calorific value coal being burnt
3. fouling of heat transfer surfaces
4. raising of steam temperature
fouling of heat transfer surfaces
1. smoky chimney exit
2. excess air in flue gases
3. measuring carbon mono-oxide in flue gases
4. measuring temperature of flue gases at exit of furnace
measuring carbon mono-oxide in flue gases
1. same
2. more
3. less
4. less or more depending on size of boiler
more
1. better burning
2. more calorific value
3. less radiation loss
4. medium sized units
better burning
1. 200-400 kcal/kg
2. 800-1200 kcal/kg
3. 2000-4000 kcal/kg
4. 5000-8000 kcal/kg
2000-4000 kcal/kg
1. kg of steam produced
2. steam pressure produced
3. kg of fuel fired
4. kg of steam produced per kg of fuel fifes
kg of steam produced per kg of fuel fifes
1. tonnes/hr. of steam
2. pressure of steam in kg/cm2
3. temperature of steam in °C
4. all of the above
all of the above